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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efce416ef17262441a89ed10c482c36044d0aa2df3e258e1cab637b31298491e' 
  AND token = 'd474BTAz9s8LRIW2xqZqy0GKcmZUWWJnfjPcLTHqSqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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