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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb051f437be6ab2dfde770980cfd6f8ca069cfc91fe3c2288fda6f585c1ba77c' 
  AND token = 'Rx6o3YL9iUKROUpZshPTqmWKUcl7Yyz40P+Z4Nk3u60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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