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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd205901c3557c9341afdc9c2cd047b0134d4d4de731d48c20e6c53d2597b3ee6' 
  AND token = 'IvRTOLvNJJV50NLVr2ts0C73Zm9Z/XOzmJPPXSuHun8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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