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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33630fd99fab2a8e350a5a24321ef6aa77d2ac6573ddce911a1d94e55c17852' 
  AND token = 'SK5l121bMyiHPzUqQM3Vpwab0RQkWF/VJyzrG28JI08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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