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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689900478725e59c4a48c9cb4c8381e7dd8e0b131434e2e70cd7f91496e8917c' 
  AND token = 'f9rkApCy6WXcon07EKGDmyY/OpTzoxQp/JasVucwFqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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