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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16cafc0cf933a8a097bd179c73aefec4d4b3b42689a7f9752e0d836055e992c3' 
  AND token = 'eRTDTiwtEYNsC5YeL9m3CvFxFipGp26s5tx/mY4/ahk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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