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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f533660e268f78a09b435ca3234d53a3335d526d3c2bad1a98e0be9f5940abd5' 
  AND token = 'AWkC7O8l1mdcJBUTMYIDocd0I3DBNSVKLIObpjlG+dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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