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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a5b2864365bf2ea23ba731c65bb41773051bbc393c62f79b14865872479e69' 
  AND token = 'LbYv+4HEWuyYbDyJjz/Ovl8i1e9g3+oGTA7KWMrTk90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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