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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91cbe620a81e75de6f3eeca4f10872238c1d5ac2a40b52ffe2af71d589405ed' 
  AND token = '8NU4Zbef/OHHYykP1I7FaqOSm/NkX9UDqc1hx/L/pOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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