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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32970817383c0054130b9d6f4ef79b8f534eac20278141ce4e36b114fa6579a' 
  AND token = 'n8o+JW6UWMYOY1eCsyJ9A9/2nvVyj1WxAkEpZHYN0Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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