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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa3203aa0f261a87e36c9c56630951c6fcb55c28eccd7e2d0d98c8478c4d0dd' 
  AND token = 'Q4DE/cdPoNOA0xZ5rhpZ+3x53xThWADARzV3AWQQrFk=' 
  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"
    }
  }
}