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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92119d6989db43e02a38c760c7a25675c8adda158c943d1582d03884377c504' 
  AND token = 'LtyQ+v/jfJSqXmHSCJxc5a64N+SfkzJdwp2JV+515Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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