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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244b5bfab7a2ac1379cfb9f89d59ca0dd202ee13c99c343fd3ef8bc630dc7a98' 
  AND token = 'vk5VAhXmxO13NDgOlR1f7bB84Bx4KNdXW9wl63g6diM=' 
  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"
    }
  }
}