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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3220f03175eb627c35e6dd09abca64d50ceb8cd02a17fac98776aa7ba42d804' 
  AND token = 'oftGOzRwOyewd7Dt8b3cb3BRObYN2OceVulgDYJMDxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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