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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f89d5e9b99e6ff5fc55b5d8b2f8799174ddc233f99ed87b03d9137006bedea' 
  AND token = 'YTvEu9g4PEQeDc+/Ae7zk59pScitfQy9lULWqh7JCDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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