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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c5dcd7797cee92862d1124c2405dbdb39438d4a75418f6e8f10755b9372b6f' 
  AND token = 'G148HgxabTPZevkIoQ0gkudVUP0Da19xg11uxY6+ayo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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