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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245eadb988e1cec58f18c83c3d8b0f4f1056c0856849de27c7998449d3198eaa' 
  AND token = 'MoGUokG4Y+ZFs5uBdoApvh2tXvtIll/ZUN8wMrsFud4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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