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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3526ea63e0c57e6abecf5dac4c9099fb8f40e74d70564abfb1353a510eb4ef3e' 
  AND token = 'keMorRjP20Rrzs5wkoe4K6IikWivi4LhjlxbWc+6e5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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