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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82effc6098e07c3a7c1133b028afb5a425ec9742836fe3664d6aa3ff261bf7f' 
  AND token = 'hU20S3+3XF30KLLbqWYP6EKGR8vfY20BWMwZ0R8lAM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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