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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9e6fecd5d81f0e61d97e2b6b6181c35c9d0b3d3267fc0f840657c49c81b2a5' 
  AND token = 'ZeiAg/2r0pKE+8tHolG6is/94YeY1Y/hH5caM8xDz5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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