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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9168f6368b7abebfe75e1dd346c17f29ff4c38e6ede2042d69191e6cc7b1d7e1' 
  AND token = 'yJLmmM4iep+raDWUiJunfS6tugqoCL1LUK3zU2h8gPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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