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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dacb77e11f1f596fba84f70924336e8738a1a3e707fcd3d2373993b827fe301' 
  AND token = 'g1hzmcGY7p2CB81fVmXI5TMuWhmJG5xf9lOTuG7eew8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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