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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f016a489e8f9233bea74cdb4e450764d9497dc74bd4fc26e676015d3589251fc' 
  AND token = 'v/dNEt5WNQlJt/Vav0ce6ByjHozQj5vXE+zFQzWwU68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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