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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10fe1e58c28080df01ba99fe38a8dc109b44d15b702c1c4c34efd18a74b01cf' 
  AND token = '7Y+COt2cT9X3uysvpHZ0i64kequbJpQ9im2RwAwAlOI=' 
  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"
    }
  }
}