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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59064c4a33eef3f51d1f0d6433754717cdad85f171833f3a62dc63a0722ce7f' 
  AND token = 'XxoUrrFWvvXkc1a20QzbqwY38KGnItV1hq6eo+yUFkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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