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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf550fd623de861153fa05688efcfd3a3cb5652b39a602c42effadc47da2cc49' 
  AND token = 'n8xpSnjslcyWk5+aF1n/rneCX4ouhcWmMnPDA9TGJKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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