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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d847d4c655e9511bf177caa0681e5269215ae8eaac00841e01e17a38273fa2' 
  AND token = 'X1O8qgrlV9p7tAnTeSz9u9T/icl78Vjzcl8LK3rx94A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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