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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c15ec33b54276a5466041b4e9e80e0af5ad202586260dc8675a152c7acb3368' 
  AND token = 'iaw0IJeFnq5hNLezmjLSCdlhQtS9qqP6Va44/L7OMyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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