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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b567f6b3394e6e0c11a6ffef4ff66ddf46ace5e5bd326495aab6d227f2b406' 
  AND token = '1rym0hRHARAnQGmZ8eQbqMCaZWJtEya+5kvbRibnYiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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