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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8873c56442f8f0f8cbe6d810dc723784b102b8f37fadd1d8a46c9cae327bfbc' 
  AND token = '2ZFv/WdgyhShWc3M5JKdpelBUrcSu5oc39sYUalJPOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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