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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6c8fb62190415a2af328875cbb3aa944ded0536cb8f54aaab3c13425166d91' 
  AND token = 'PwfZRZO5J1DsA/2YzNEaP7diy8RiJh3XxiCGzf0tnjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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