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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978c72c5251708c5b587cc89944134ae0da3a7ecf6f2e81f2a2dcf2e59beecef' 
  AND token = '8J93nV1GvsvIHB9SCIIYVGo+UGvU3FVfvd8y/sHbCK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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