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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dadc5fecfcaef17d4a1d4f1af1d44c5243e3313187b68fdab1f3a4a661fc0a3' 
  AND token = 'vY2h2xals+ilY5a74qFvZe4kfb5Tw/CJvS5i/J3A0rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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