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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e4deb2046f2f71afa635db0e70d42bfd9df47d5b921c3c1c2017d1e98d7544' 
  AND token = 'FRfElghEMuNDm/1QJLl3gmCveDOW0gvWGftjG7h3hXM=' 
  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"
    }
  }
}