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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb03d31ad73b92acdc8eb98fff8c9ba7c80bd78b03bf74c84a9a7d872afa593' 
  AND token = '0I3ZCocOhCQM7VB/lBBQQ3iykc8uMg2/+Rv9XXvMpFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}