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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de20ea1d69261894abe3961b1a51929e180f2d9b6af2daab4bbbb640dc69297' 
  AND token = 'Ii9oSfegyjR1Y3joteaTaAqq6++q7JsolZt988J/jsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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