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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae766a8845fc3b5bd3a39c739bb4eaee1cf0530ef9599cf20123b9caaa512d9' 
  AND token = '1DRkjEU29vKiO6t+MQZWOsqbE3/UA2LPEeo9WVpfhRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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