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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df5f9142886cf7cf2601b08f8d0e1e0992fff0236a474c876259fa59d15655c' 
  AND token = 'bAJhbG6KQdBqabJjMJdrWHr1fA9Ao8reWAmAG86568Y=' 
  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"
    }
  }
}