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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257f3a06eb2edbc6d44ef675d8d524603cd0245440b406a255a049d164586ac7' 
  AND token = '0IPE9VVHhZh3RvFK0x7s/TI5D70mqvVx5pGCjJSYt4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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