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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f30672d9cffa08dd99d80e05af4cfa40e008e07b178b14dc39cf9c4d7680039' 
  AND token = 'e0jU0EA8+wN4KMRlGtUnHg/JWb6PjSvzr6Ma0EQ0JX8=' 
  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"
    }
  }
}