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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5127df12edb5aaad00c67d7edd173d3fc11cd0ce30323492ad6267a3158e192' 
  AND token = 'JMb5w3i1T5h6Bs4jwfCLZIpHA34okK9va5Gg3RKYtN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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