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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e386e67402b0af3772334fcb28f7aa32dd0d9010eb7df31fbba0a2c878e313a0' 
  AND token = '/VA21Y2Rmy+C4OTwy/Y3v3IJJwVKry4kiflQGX5r6QE=' 
  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"
    }
  }
}