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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65983b9f3b8f901b8e5e14a845a1291bc2f8366cef2d5df836483eff0fcf4c9a' 
  AND token = '9So4x1MgEVa+nuBE+PEIaZmg2NUSfxXC3YDJvsHXofE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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