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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f72fa79061780448b2a513390b2663317604c7d38f4bfa327e0f24b606abb0' 
  AND token = 'RAG8PgTwKCq3AlxyDotdx0Ocbr9+RlCnKFtMmS35/WE=' 
  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"
    }
  }
}