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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9665c9d2bd7d0bfc08984ad55ca774651868e006efbb2d7d0574d1160a7fc569' 
  AND token = '9IOYXPL24t4lycdeqb7ho/KNZ0CXOqj+HJSsnhpqXm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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