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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f3877794eac9bb7fef4fe0e81e37374444ed3b0e9b14ba1ab28975c0e0ea6e' 
  AND token = 'ydFyPZuoe5eGL93l/dqVNXoZtIa+1V9qO/c3uHvUfXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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