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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040b1bed6e7a8992dc063d1e17b250400064c5c72d80537b54246a34d737c9e7' 
  AND token = 'dlDHAIxYbFRktOmVwp2oxBLRWHblf1q3Q8aih20VaKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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