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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fba2b9f1f24672b00b56924eaa91da6b0fa1847ddbc1687e9163e3045eefb7e' 
  AND token = 'MJa2NLStS/sWUNhDx0wYiGek2jRjFscV11vJsLFjEDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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