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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e352374025f8fb11d21a39be8af14fc2ba35f1588aa63d6275ac4865ad3027a5' 
  AND token = '7ieNObcg5If/tbrrf/43ux97PQDUV7G5ma5DrabPs1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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