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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037b675c325495a2e63e35096c4088407c4011d9b6f0bf68be45330504dfe7e6' 
  AND token = 'WEe0UDnYZIixU8h9lZHX3FpH8GqlLldzDaSY4HYlfHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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