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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce6309bad73d8b75b749adadb6e1cb529d87e5b760d8fb04f0141482b412fd2' 
  AND token = 'EClbIyuuRv9Ey3T2XF9v7lq5SeiE3DoNM8ZoZtLbu/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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