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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2195ab4a3f7f38f2286c781515e3755e100dd67d2d3ba6af374972f6184db1f7' 
  AND token = '16fLs6xxeje1z7is2gIl+PiYi0ovjG9GhI9d/kvYGh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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