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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee1941c09b14cb28e619552992cc335eb62791fd7292fa5cbfb68ff1f634a38' 
  AND token = 'cF5s/QgbKa1gF3CvGb6vD0f5yjyS35bBusAPGY6dYdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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