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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1747e48233ff7977605bf51c27eac7682134eca13a52ecd14f6b3eaa4275bd' 
  AND token = 'AEyp12U6o8gsXpdMtu3w4OOaoCeooW5RLwdM6jW3XJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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